According to a US Treasury sanctions notification last year, Khan, a former senior leader of the Pakistani Taliban, was appointed head of the IS’s branch in Afghanistan in January 2015 after pledging allegiance to IS leader Abu Bakr al-Baghdadi.

Khan helped establish training camps in western Afghanistan for the IS and was responsible for a series of suicide attacks that killed up to 30 people in Jalalabad in April 2015, the Pentagon said.